Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc gia » thuoc giao, quoc gia, thuoc ma
thanh dat » thanh san, thanh hai, thanh van
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) nang x hoi. hieu van nam thuoc gia thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. hieu van nam thuoc gia thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x hoi. hieu van nam thuoc gia thanh dat cua tre*.